13-03-2019, 04:56 PM
Why not put it about 1 metre ( + / - whatever suits) from the shed and then bond the coax outer to the shed to use as the virtual ground plane ? It will definitely need a ground plane so why not make the shed fulfill that task.
If you can elevate the base of the vertical a little bit (ideally the shed height at the side where the vertical mounts) then that is even better. The bonding will be more direct. None of the neighbours will see any difference between 43 feet and 50 feet high
Ditto the metal fencing. Put the vertical near the fence and use that as the ground plane. ( I did that trick years ago with a multiband trap vertical when I had a long chainwire fence with top piping joining all of the posts - worked well even with those untuned "radials" going in just two directions. The trap vertical was clamped/attached to the top of one of the galv fence posts.)
If the shed and fence "meet" then put the vertical near the junction and use all three bonded together.
The outer braid from RG213 coax is great for that bonding - cut a suitable length then grip a bit of the exposed inner in a vice and pull it out of the braid + protective sheath. Trim to length, expose about 50mm of braid and flatten it with your fingers, pierce the flat bit with a philips screwdriver to make a neat hole then tin (solder) the exposed braid. Easy to put a metal screw or bolt up to 6mm through to do the metal bonding bit. Seal up the ends of the coax outer to stop moisture getting in and causing corrosion of the copper braid - non-acidic silicone is great, in black is better than clear for outside use..
PS That same trap vertical spent quite some time (about 4-5 years) in the centre of another galv sheeting roof - but I did spend some time making sure that the galv sheets were actually joined together electrically. I worked all over the world using that arrangement. It now resides at my grandson's home (F-call) with it attached to the top of yet another chainwire fence section, 40 years after it's first placement on one.....
If you can elevate the base of the vertical a little bit (ideally the shed height at the side where the vertical mounts) then that is even better. The bonding will be more direct. None of the neighbours will see any difference between 43 feet and 50 feet high
Ditto the metal fencing. Put the vertical near the fence and use that as the ground plane. ( I did that trick years ago with a multiband trap vertical when I had a long chainwire fence with top piping joining all of the posts - worked well even with those untuned "radials" going in just two directions. The trap vertical was clamped/attached to the top of one of the galv fence posts.)
If the shed and fence "meet" then put the vertical near the junction and use all three bonded together.
The outer braid from RG213 coax is great for that bonding - cut a suitable length then grip a bit of the exposed inner in a vice and pull it out of the braid + protective sheath. Trim to length, expose about 50mm of braid and flatten it with your fingers, pierce the flat bit with a philips screwdriver to make a neat hole then tin (solder) the exposed braid. Easy to put a metal screw or bolt up to 6mm through to do the metal bonding bit. Seal up the ends of the coax outer to stop moisture getting in and causing corrosion of the copper braid - non-acidic silicone is great, in black is better than clear for outside use..
PS That same trap vertical spent quite some time (about 4-5 years) in the centre of another galv sheeting roof - but I did spend some time making sure that the galv sheets were actually joined together electrically. I worked all over the world using that arrangement. It now resides at my grandson's home (F-call) with it attached to the top of yet another chainwire fence section, 40 years after it's first placement on one.....
Doug VK4ADC @ QG62LG51
http://www.vk4adc.com
This Forum is only going to be as interesting as the posts it contains.
If you have a comment or question, post it as it may trigger or answer the query in someone else's mind.
http://www.vk4adc.com
This Forum is only going to be as interesting as the posts it contains.
If you have a comment or question, post it as it may trigger or answer the query in someone else's mind.